@media screen and (max-width: 767px) {
  #primary #content .content-container {
    width: 100% !important;
  }
  #primary #content .content-container .post_content,
  #primary #content .content-container .post-entry-content {
    flex-direction: column;
    width: calc(100% - 40px);
    margin: 35px auto 0;
  }
  #primary #content .content-container .single-post.entry-content {
    max-width: 100%;
  }
}